Thursday, April 25, 2013

Showing an image when dragging any tag in HTML

Chrome and Safari support displaying a ghost image for draggable objects out of the box, Firefox does not. It's not a big deal, I'd say a matter of one event handler.

This is a sample HTML:
Drag Me!

and JavaScript code:
$(function () {
    var dragImage = document.createElement("img");
    dragImage.src = "/image/to/show/when/dragging.jpg";
    function handleDragStart(e) {
        e.dataTransfer.effectAllowed = 'move';
        e.dataTransfer.setDragImage(dragImage, e.layerX, e.layerY);
    }

    $("#draggableObject").get(0).addEventListener('dragstart', handleDragStart, false);
});

Native HTML5 Drag and Drop

MDN::dataTransfer

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